WOW!!! That's is long...... Say did you have too much data on the Array? Couldn't you just settle for smaller sized HDDs if it's just the OS?
I didn't have too much data (about 550 GB / 1.5 TB), but as I understand it - the amount of time would be about the same regardless of whether the drives were empty or full. I think that even "empty" areas are "parity"d in the RAID array.
Exactly, that's why in a RAID array we tend to have smaller sized discs for different purposes..... each set comprises of sets of small sized HDDs depending on what the drives are to be used for.